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首页> 外文期刊>Facies >Microfossil assemblages and relative sea-level fluctuations in a lagoon at the Oxfordian/Kimmeridgian boundary (Upper Jurassic) in the eastern part of the Paris Basin
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Microfossil assemblages and relative sea-level fluctuations in a lagoon at the Oxfordian/Kimmeridgian boundary (Upper Jurassic) in the eastern part of the Paris Basin

机译：巴黎盆地东部牛津/基米底吉安边界（侏罗纪上缘）泻湖中的微化石组合和相对海平面波动

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The Late Oxfordian–Early Kimmeridgian interval of the eastern part of the Paris Basin is characterized by a carbonate succession deposited in shallowmarine platform environments. The Gudmont-Villiers section is represented by deposits ranging from barrier to typical lagoonal environments often poor in macrofossils. Previously unpublished calcareous microfossils are more abundant and provide alternative paleoenvironmental indicators. They also provide a biostratigraphical framework across the Oxfordian–Kimmeridgian boundary. The evolution of microfossil associations (algae and benthic foraminifera) in the lower part of the section, based on statistical analyses, is correlated to the sea-level variations. The first highly diversified association composed of small agglutinated and calcitic foraminifera (miliolids, textulariids, Spirillina, Trocholina, Molherina basiliensis etc.) characterizes high sea-level deposits; a second association richer in large agglutinated foraminifera (Alveosepta jaccardi, Everticyclammina, Nautiloculina oolithica) is significantly abundant in low sea-level deposits. A third association characterizes beds with a significant occurrence of encrusting microorganisms and algae (Lithocodium aggregatum, Troglotella incrustans, Cayeuxia piae, dasycladaceans). The upper part of the section is marked by more argillaceous beds and by the occurrence of one opportunist taxon (Lenticulina). This study shows that the microfaunaflora evolution in an internal carbonate platform environment constitute an efficient tool to determine variations in the relative sea level.
机译：巴黎盆地东部后期的牛津阶-基米底阶早期层段的特征是沉积在浅海平台环境中的碳酸盐岩演替。 Gudmont-Villiers部分的沉积物从障碍到典型的泻湖环境不等，这些环境通常在大型化石中贫乏。以前未发表的钙质微化石更为丰富，并提供了替代性的古环境指示剂。他们还提供了横跨牛津-基默尼第纪边界的生物地层学框架。根据统计分析，该区域下部的微化石协会（藻类和底栖有孔虫）的演化与海平面变化有关。第一个高度多样化的协会是由小的凝集和钙化的有孔虫（mil虫科，textulariids，Spirillina，Trocholina，Molherina basiliensis等）组成，其特征是海平面高。在低海平面沉积物中，富含大量凝集性有孔虫（Alveosepta jaccardi，Everticyclammina，Nautiloculina oolithica）的第二种关联非常丰富。第三个关联的特征是床层中存在大量包裹微生物和藻类（集合石藻，硬皮细粉菌，小夜蛾，达克梭菌）。该部分的上部以更多的泥质床和一个机会主义的分类群（Lenticulina）为特征。这项研究表明，内部碳酸盐平台环境中的微动植物群的演变是确定相对海平面变化的有效工具。

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